Not as simple as that though. I play on an RP PvPvE server and the PvP part has to be consensual. If you don't initiate contact and kill someone or damage/kill their base/dinosaurs, then you're in for a telling off (at least) from the admin.
I agree with Paul, PvP should be player v player, not player v empty space because they want to grief (I know not everyone can arrange stuff but we lost some dinos and a player last week to a snidey little sod who thought he'd smash stuff up with impunity because everyone was offline, but they weren't and he got caught with his hand in the cookie jar).